Instructables

Can A Nexus 7 be charged by any phone charger with a micro-b

I have been charging it with a USB, because I can't find my  ASUS wall charger. 
There is a Celltech wall charger with a micro B at home .
I know it fits; would it work correctly ? 

Wilmette (author) 2 years ago
Thanks to you both. Woukld either of you care to collaborate on an ible : "Will this USB-microB Charger Work On My Device " ? Or do it yourselves ?
Thanks again.
Voltage and current are pretty basic and have been covered in many instructables. Plus these little tidbits about voltage and amperage of USB charges has also been covered many times here on the forums and in many instructables.
kelseymh2 years ago
Most probably, yes. The USB specification for voltage and minimum current is standard, so all of the USB-based chargers have to respect it. However, does your phone have a "minimum" current it expects to see for charging? This ought to be the USB-spec (500 mA), but check your manual to see if the manufacturer did something stupid.

If your phone can draw higher current to charge faster, then its possible that using a replacement charger will take longer than you're used to. In that case, either spend the money to buy a replacement, or plug your phone in overnight so you don't notice the extra time :-)
Wilmette (author)  kelseymh2 years ago
Thanks. Please let me know if I understand this.
The Output specs on the original charger were 5 V / 2.00A
As long as both of the specs on the charger I amusing are less than those numbers, I am safe. slower, perhaps, but safe. V must be less than or equal to 5 ; mA must be less than or equal to 2000? I I should probably not let it charge after 100%, or maybe 95% to leave a margin of safety/
Is this correct ? thanks
.
The voltage needs to be the same (and will be, for any USB-compatible charger). The current rating on the charger isn't how much it "pushes out," rather, it is the maximum amount the charger can provide without overheating or burning out. So you'd like to have a charger which is rated for at least that 2A; more won't do any harm.

Your phone will pull the current as it needs to do the job, which may not be the full 2 A. If your charger is rated for less, then check it the first time you use it: if it gets extremely warm, stop using it (a little warm is pretty typical, sinc e you're dealing with a resistive circuit :-).



Reguardless the charger needs to output 5V. considering you can charge the phone through a PC USB cable then it will take at least 500mA. So any charger that offers 5V @ 500mA or more will be fine. If you find a charger that offers more then 2A that is fine too. The power supply doesn't push that amperage at the device the device only pulls what it needs. You won't be able to over charge the phone as it has its own charge monitoring circuit built in. So once it's full it will stop drawing power from the charger.